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Convertible Senior Notes and Related Transactions - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2019
USD ($)
$ / shares
shares
Aug. 01, 2020
USD ($)
$ / shares
shares
Aug. 03, 2019
USD ($)
May 04, 2019
USD ($)
Aug. 01, 2020
USD ($)
$ / shares
shares
Aug. 03, 2019
USD ($)
Feb. 01, 2020
USD ($)
Debt Instrument [Line Items]              
Amortization of debt discount         $ 5,197,000 $ 2,662,000  
Amortization of debt issuance costs         $ 661,000 276,000  
Option to purchase, number of shares (in shares) | shares 11.6            
Conversion price of convertible senior notes (in dollars per share) | $ / shares $ 25.78       $ 25.78    
Convertible note hedge cost $ 61,000,000.0            
Warrants outstanding (in shares) | shares 11.6 11.6     11.6    
Strike price of warrants (in dollars per share) | $ / shares $ 46.88 $ 46.88     $ 46.88    
Proceeds from issuance of warrants       $ 28,100,000 $ 0 28,080,000  
Deferred tax liability   $ 11,200,000     11,200,000   $ 11,200,000
Deferred tax asset   12,300,000     12,300,000   12,300,000
Senior Notes | 2.00% Convertible Senior Notes Due 2024              
Debt Instrument [Line Items]              
Interest rate 2.00%            
Convertible debt issued $ 300,000,000            
Conversion ratio 0.0387879            
Conversion price (in dollars per share) | $ / shares $ 25.78            
Percentage of principal and interest of the Notes that the Company may be required to purchase in the event of a fundamental change 100.00%            
Minimum percentage of holders of the Notes which may be able to declare the Notes to be due and payable upon the occurrence of certain events of default 25.00%            
Percentage of principal and interest that may be declared due and payable upon the occurrence of certain events of default 100.00%            
Effective interest rate 6.80%            
Amortization of debt discount   2,600,000 $ 2,400,000   5,200,000 2,700,000  
Amortization of debt issuance costs   200,000 $ 200,000   400,000 $ 200,000  
Initial Purchasers | Senior Notes | 2.00% Convertible Senior Notes Due 2024              
Debt Instrument [Line Items]              
Debt issuance costs $ 3,800,000            
Third Party Offerers | Senior Notes | 2.00% Convertible Senior Notes Due 2024              
Debt Instrument [Line Items]              
Debt issuance costs $ 1,500,000            
Level 2 | Senior Notes | 2.00% Convertible Senior Notes Due 2024              
Debt Instrument [Line Items]              
Fair value of convertible senior notes   $ 163,000,000.0     $ 163,000,000.0   $ 272,000,000.0